[openib-general] [PATCH 17/17] ehca: PPC64 assembler helper routines

[Roland Dreier]

 > +#define clear_cacheline(adr) __asm__ __volatile("dcbz 0,%0"::"r"(adr))

Have you quantified how much of a win using dcbz is for you?

If it is a sufficient win to be worth using, I still think this is
really the wrong abstraction, because it requires the driver code that
uses clear_cacheline() to know that cachelines are 32 bytes.

Something like clear_range() would be better, where the cacheline size
is encapsulated within the implementation.

 - R.